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. 2023 Oct 12;14:6424. doi: 10.1038/s41467-023-42148-y

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© The Author(s) 2023

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 5 — Comparison of thermostated ring polymer molecular dynamics based a infrared (IR) spectra, b Raman anisotropic (Raman-aniso), and c Raman isotropic (Raman-iso) spectra of N-methylacetamide at 300 K varying with the external electric field intensity. The inset in each panel zooms in the corresponding C-O stretching vibration peaks. Note that the high-frequency bands above 2800 cm⁻¹ a–c are multiplied by a factor of 10, 0.1, and 0.05 to show the peaks in a similar scale. Source data are provided as a Source Data file.